Bump pg-promise from 10.5.5 to 10.5.6
Bump pg-promise from 10.5.5 to 10.5.6

Bumps [pg-promise](https://github.com/vitaly-t/pg-promise) from 10.5.5 to 10.5.6.
- [Release notes](https://github.com/vitaly-t/pg-promise/releases)
- [Commits](https://github.com/vitaly-t/pg-promise/compare/10.5.5...10.5.6)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
smashwilson/hubot-markov